The AVRs with low pin count have too few pins to use parallel communication during High-Voltage programming. They use serial communication instead. This means that less signals have to be routed. Note that this interface is only intended for use on-board STK600.
Mount the routing and socket card and the target device. See the Socket System section on how to do this.
Use the a 10-wire cable supplied with the STK600 to connect the PROG DATA to the target device, shown in the picture below.
Note for ATtiny24/44/84 a cable on PROG CTRL is required as well, as for the Parallel High Voltage Programming.
Mount both the VTARGET jumper and the RESET jumper.
Ensure that VTarget is between 4.5V and 5.5V before programming.
See the Programming Dialog pages in the AVR Studio help file for information on the STK600 programming dialog.